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Finding the Fourth Proportional to 438,436.80, 656,488.80 and 279,806.40

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Solution

The fourth proportional to 438,436.80, 656,488.80 and 279,806.40 is: 418,965.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,436.80 : 656,488.80 = 279,806.40 : x
  2. Step 2: Convert to fraction form
    438,436.80/656,488.80 = 279,806.40/x
  3. Step 3: Cross multiply
    438,436.80x = 656,488.80 × 279,806.40
  4. Step 4: Simplify right side
    438,436.80x = 183,689,767,768.32
  5. Step 5: Solve for x
    x = 183,689,767,768.32/438,436.80
  6. Step 6: Final answer
    x = 418,965.21

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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.