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Finding the Fourth Proportional to 972.21, 1,458.29 and 542.10

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Solution

The fourth proportional to 972.21, 1,458.29 and 542.10 is: 813.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.21 : 1,458.29 = 542.10 : x
  2. Step 2: Convert to fraction form
    972.21/1,458.29 = 542.10/x
  3. Step 3: Cross multiply
    972.21x = 1,458.29 × 542.10
  4. Step 4: Simplify right side
    972.21x = 790,529.01
  5. Step 5: Solve for x
    x = 790,529.01/972.21
  6. Step 6: Final answer
    x = 813.13

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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.