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Finding the Fourth Proportional to 389,437.56, 584,417.28 and 136,718.80

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Solution

The fourth proportional to 389,437.56, 584,417.28 and 136,718.80 is: 205,169.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,437.56 : 584,417.28 = 136,718.80 : x
  2. Step 2: Convert to fraction form
    389,437.56/584,417.28 = 136,718.80/x
  3. Step 3: Cross multiply
    389,437.56x = 584,417.28 × 136,718.80
  4. Step 4: Simplify right side
    389,437.56x = 79,900,829,249.88
  5. Step 5: Solve for x
    x = 79,900,829,249.88/389,437.56
  6. Step 6: Final answer
    x = 205,169.81

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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.