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Finding the Fourth Proportional to 612,010.40, 918,015.60 and 425,386.40

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Solution

The fourth proportional to 612,010.40, 918,015.60 and 425,386.40 is: 638,079.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,010.40 : 918,015.60 = 425,386.40 : x
  2. Step 2: Convert to fraction form
    612,010.40/918,015.60 = 425,386.40/x
  3. Step 3: Cross multiply
    612,010.40x = 918,015.60 × 425,386.40
  4. Step 4: Simplify right side
    612,010.40x = 390,511,351,227.84
  5. Step 5: Solve for x
    x = 390,511,351,227.84/612,010.40
  6. Step 6: Final answer
    x = 638,079.60

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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.