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Finding the Fourth Proportional to 138,658.48, 191,332.22 and 78,225.59

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Solution

The fourth proportional to 138,658.48, 191,332.22 and 78,225.59 is: 107,942.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,658.48 : 191,332.22 = 78,225.59 : x
  2. Step 2: Convert to fraction form
    138,658.48/191,332.22 = 78,225.59/x
  3. Step 3: Cross multiply
    138,658.48x = 191,332.22 × 78,225.59
  4. Step 4: Simplify right side
    138,658.48x = 14,967,075,882.71
  5. Step 5: Solve for x
    x = 14,967,075,882.71/138,658.48
  6. Step 6: Final answer
    x = 107,942.02

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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.