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Finding the Fourth Proportional to 930.05, 1,283.47 and 557.04

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Solution

The fourth proportional to 930.05, 1,283.47 and 557.04 is: 768.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.05 : 1,283.47 = 557.04 : x
  2. Step 2: Convert to fraction form
    930.05/1,283.47 = 557.04/x
  3. Step 3: Cross multiply
    930.05x = 1,283.47 × 557.04
  4. Step 4: Simplify right side
    930.05x = 714,944.13
  5. Step 5: Solve for x
    x = 714,944.13/930.05
  6. Step 6: Final answer
    x = 768.72

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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.