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Finding the Fourth Proportional to 1,057.60, 1,578.76 and 928

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Solution

The fourth proportional to 1,057.60, 1,578.76 and 928 is: 1,385.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,057.60 : 1,578.76 = 928 : x
  2. Step 2: Convert to fraction form
    1,057.60/1,578.76 = 928/x
  3. Step 3: Cross multiply
    1,057.60x = 1,578.76 × 928
  4. Step 4: Simplify right side
    1,057.60x = 1,465,089.28
  5. Step 5: Solve for x
    x = 1,465,089.28/1,057.60
  6. Step 6: Final answer
    x = 1,385.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.