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Finding the Fourth Proportional to 930.93, 1,284.80 and 557.91

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Solution

The fourth proportional to 930.93, 1,284.80 and 557.91 is: 769.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.93 : 1,284.80 = 557.91 : x
  2. Step 2: Convert to fraction form
    930.93/1,284.80 = 557.91/x
  3. Step 3: Cross multiply
    930.93x = 1,284.80 × 557.91
  4. Step 4: Simplify right side
    930.93x = 716,802.77
  5. Step 5: Solve for x
    x = 716,802.77/930.93
  6. Step 6: Final answer
    x = 769.99

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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.