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Finding the Fourth Proportional to 1,042.12, 1,438.13 and 570.01

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Solution

The fourth proportional to 1,042.12, 1,438.13 and 570.01 is: 786.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.12 : 1,438.13 = 570.01 : x
  2. Step 2: Convert to fraction form
    1,042.12/1,438.13 = 570.01/x
  3. Step 3: Cross multiply
    1,042.12x = 1,438.13 × 570.01
  4. Step 4: Simplify right side
    1,042.12x = 819,748.48
  5. Step 5: Solve for x
    x = 819,748.48/1,042.12
  6. Step 6: Final answer
    x = 786.62

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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.