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Finding the Fourth Proportional to 627,417.78, 865,869.72 and 355,538.40

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Solution

The fourth proportional to 627,417.78, 865,869.72 and 355,538.40 is: 490,661.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    627,417.78 : 865,869.72 = 355,538.40 : x
  2. Step 2: Convert to fraction form
    627,417.78/865,869.72 = 355,538.40/x
  3. Step 3: Cross multiply
    627,417.78x = 865,869.72 × 355,538.40
  4. Step 4: Simplify right side
    627,417.78x = 307,849,934,857.25
  5. Step 5: Solve for x
    x = 307,849,934,857.25/627,417.78
  6. Step 6: Final answer
    x = 490,661.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.