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Finding the Fourth Proportional to 158,319.71, 218,479.56 and 85,721.36

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Solution

The fourth proportional to 158,319.71, 218,479.56 and 85,721.36 is: 118,294.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,319.71 : 218,479.56 = 85,721.36 : x
  2. Step 2: Convert to fraction form
    158,319.71/218,479.56 = 85,721.36/x
  3. Step 3: Cross multiply
    158,319.71x = 218,479.56 × 85,721.36
  4. Step 4: Simplify right side
    158,319.71x = 18,728,364,244.46
  5. Step 5: Solve for x
    x = 18,728,364,244.46/158,319.71
  6. Step 6: Final answer
    x = 118,294.58

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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.