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Finding the Fourth Proportional to 930.79, 1,284.40 and 557.76

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Solution

The fourth proportional to 930.79, 1,284.40 and 557.76 is: 769.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.79 : 1,284.40 = 557.76 : x
  2. Step 2: Convert to fraction form
    930.79/1,284.40 = 557.76/x
  3. Step 3: Cross multiply
    930.79x = 1,284.40 × 557.76
  4. Step 4: Simplify right side
    930.79x = 716,386.94
  5. Step 5: Solve for x
    x = 716,386.94/930.79
  6. Step 6: Final answer
    x = 769.65

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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.