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Finding the Fourth Proportional to 625,643.40, 938,465.10 and 424,876.80

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Solution

The fourth proportional to 625,643.40, 938,465.10 and 424,876.80 is: 637,315.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    625,643.40 : 938,465.10 = 424,876.80 : x
  2. Step 2: Convert to fraction form
    625,643.40/938,465.10 = 424,876.80/x
  3. Step 3: Cross multiply
    625,643.40x = 938,465.10 × 424,876.80
  4. Step 4: Simplify right side
    625,643.40x = 398,732,048,599.68
  5. Step 5: Solve for x
    x = 398,732,048,599.68/625,643.40
  6. Step 6: Final answer
    x = 637,315.20

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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.