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Finding the Fourth Proportional to 520,025.80, 780,038.70 and 425,547.40

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Solution

The fourth proportional to 520,025.80, 780,038.70 and 425,547.40 is: 638,321.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,025.80 : 780,038.70 = 425,547.40 : x
  2. Step 2: Convert to fraction form
    520,025.80/780,038.70 = 425,547.40/x
  3. Step 3: Cross multiply
    520,025.80x = 780,038.70 × 425,547.40
  4. Step 4: Simplify right side
    520,025.80x = 331,943,440,684.38
  5. Step 5: Solve for x
    x = 331,943,440,684.38/520,025.80
  6. Step 6: Final answer
    x = 638,321.10

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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.