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Finding the Fourth Proportional to 438,279.40, 657,419.10 and 280,815.40

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Solution

The fourth proportional to 438,279.40, 657,419.10 and 280,815.40 is: 421,223.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,279.40 : 657,419.10 = 280,815.40 : x
  2. Step 2: Convert to fraction form
    438,279.40/657,419.10 = 280,815.40/x
  3. Step 3: Cross multiply
    438,279.40x = 657,419.10 × 280,815.40
  4. Step 4: Simplify right side
    438,279.40x = 184,613,407,534.14
  5. Step 5: Solve for x
    x = 184,613,407,534.14/438,279.40
  6. Step 6: Final answer
    x = 421,223.10

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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.