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Finding the Fourth Proportional to 611,721.60, 917,582.40 and 485,750.40

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Solution

The fourth proportional to 611,721.60, 917,582.40 and 485,750.40 is: 728,625.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,721.60 : 917,582.40 = 485,750.40 : x
  2. Step 2: Convert to fraction form
    611,721.60/917,582.40 = 485,750.40/x
  3. Step 3: Cross multiply
    611,721.60x = 917,582.40 × 485,750.40
  4. Step 4: Simplify right side
    611,721.60x = 445,716,017,832.96
  5. Step 5: Solve for x
    x = 445,716,017,832.96/611,721.60
  6. Step 6: Final answer
    x = 728,625.60

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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.