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Finding the Fourth Proportional to 391,073.48, 539,681.38 and 212,225.48

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Solution

The fourth proportional to 391,073.48, 539,681.38 and 212,225.48 is: 292,871.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,073.48 : 539,681.38 = 212,225.48 : x
  2. Step 2: Convert to fraction form
    391,073.48/539,681.38 = 212,225.48/x
  3. Step 3: Cross multiply
    391,073.48x = 539,681.38 × 212,225.48
  4. Step 4: Simplify right side
    391,073.48x = 114,534,139,917.56
  5. Step 5: Solve for x
    x = 114,534,139,917.56/391,073.48
  6. Step 6: Final answer
    x = 292,871.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.