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Finding the Fourth Proportional to 929, 1,393.56 and 870.68

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Solution

The fourth proportional to 929, 1,393.56 and 870.68 is: 1,306.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    929 : 1,393.56 = 870.68 : x
  2. Step 2: Convert to fraction form
    929/1,393.56 = 870.68/x
  3. Step 3: Cross multiply
    929x = 1,393.56 × 870.68
  4. Step 4: Simplify right side
    929x = 1,213,344.82
  5. Step 5: Solve for x
    x = 1,213,344.82/929
  6. Step 6: Final answer
    x = 1,306.08

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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.