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Finding the Fourth Proportional to 438,666.80, 658,000.20 and 431,668.40

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Solution

The fourth proportional to 438,666.80, 658,000.20 and 431,668.40 is: 647,502.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,666.80 : 658,000.20 = 431,668.40 : x
  2. Step 2: Convert to fraction form
    438,666.80/658,000.20 = 431,668.40/x
  3. Step 3: Cross multiply
    438,666.80x = 658,000.20 × 431,668.40
  4. Step 4: Simplify right side
    438,666.80x = 284,037,893,533.68
  5. Step 5: Solve for x
    x = 284,037,893,533.68/438,666.80
  6. Step 6: Final answer
    x = 647,502.60

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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.