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Finding the Fourth Proportional to 438,052.60, 657,078.90 and 390,813.40

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Solution

The fourth proportional to 438,052.60, 657,078.90 and 390,813.40 is: 586,220.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,052.60 : 657,078.90 = 390,813.40 : x
  2. Step 2: Convert to fraction form
    438,052.60/657,078.90 = 390,813.40/x
  3. Step 3: Cross multiply
    438,052.60x = 657,078.90 × 390,813.40
  4. Step 4: Simplify right side
    438,052.60x = 256,795,238,977.26
  5. Step 5: Solve for x
    x = 256,795,238,977.26/438,052.60
  6. Step 6: Final answer
    x = 586,220.10

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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.