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Finding the Fourth Proportional to 653.28, 978.80 and 433.76

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Solution

The fourth proportional to 653.28, 978.80 and 433.76 is: 649.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.28 : 978.80 = 433.76 : x
  2. Step 2: Convert to fraction form
    653.28/978.80 = 433.76/x
  3. Step 3: Cross multiply
    653.28x = 978.80 × 433.76
  4. Step 4: Simplify right side
    653.28x = 424,564.29
  5. Step 5: Solve for x
    x = 424,564.29/653.28
  6. Step 6: Final answer
    x = 649.90

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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.