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Finding the Fourth Proportional to 642,603.60, 963,905.40 and 612,190.80

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Solution

The fourth proportional to 642,603.60, 963,905.40 and 612,190.80 is: 918,286.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,603.60 : 963,905.40 = 612,190.80 : x
  2. Step 2: Convert to fraction form
    642,603.60/963,905.40 = 612,190.80/x
  3. Step 3: Cross multiply
    642,603.60x = 963,905.40 × 612,190.80
  4. Step 4: Simplify right side
    642,603.60x = 590,094,017,950.32
  5. Step 5: Solve for x
    x = 590,094,017,950.32/642,603.60
  6. Step 6: Final answer
    x = 918,286.20

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.