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Finding the Fourth Proportional to 1,042.95, 1,439.28 and 570.84

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Solution

The fourth proportional to 1,042.95, 1,439.28 and 570.84 is: 787.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.95 : 1,439.28 = 570.84 : x
  2. Step 2: Convert to fraction form
    1,042.95/1,439.28 = 570.84/x
  3. Step 3: Cross multiply
    1,042.95x = 1,439.28 × 570.84
  4. Step 4: Simplify right side
    1,042.95x = 821,598.60
  5. Step 5: Solve for x
    x = 821,598.60/1,042.95
  6. Step 6: Final answer
    x = 787.76

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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.