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Finding the Fourth Proportional to 158,332.61, 218,490.91 and 86,698.80

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Solution

The fourth proportional to 158,332.61, 218,490.91 and 86,698.80 is: 119,639.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,332.61 : 218,490.91 = 86,698.80 : x
  2. Step 2: Convert to fraction form
    158,332.61/218,490.91 = 86,698.80/x
  3. Step 3: Cross multiply
    158,332.61x = 218,490.91 × 86,698.80
  4. Step 4: Simplify right side
    158,332.61x = 18,942,899,491.16
  5. Step 5: Solve for x
    x = 18,942,899,491.16/158,332.61
  6. Step 6: Final answer
    x = 119,639.91

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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.