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Finding the Fourth Proportional to 947.31, 1,421.07 and 577.76

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Solution

The fourth proportional to 947.31, 1,421.07 and 577.76 is: 866.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.31 : 1,421.07 = 577.76 : x
  2. Step 2: Convert to fraction form
    947.31/1,421.07 = 577.76/x
  3. Step 3: Cross multiply
    947.31x = 1,421.07 × 577.76
  4. Step 4: Simplify right side
    947.31x = 821,030.30
  5. Step 5: Solve for x
    x = 821,030.30/947.31
  6. Step 6: Final answer
    x = 866.70

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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.