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Finding the Fourth Proportional to 438,417.60, 657,626.40 and 318,861.60

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Solution

The fourth proportional to 438,417.60, 657,626.40 and 318,861.60 is: 478,292.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,417.60 : 657,626.40 = 318,861.60 : x
  2. Step 2: Convert to fraction form
    438,417.60/657,626.40 = 318,861.60/x
  3. Step 3: Cross multiply
    438,417.60x = 657,626.40 × 318,861.60
  4. Step 4: Simplify right side
    438,417.60x = 209,691,806,106.24
  5. Step 5: Solve for x
    x = 209,691,806,106.24/438,417.60
  6. Step 6: Final answer
    x = 478,292.40

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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.