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Finding the Fourth Proportional to 947.68, 1,421.40 and 384.88

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Solution

The fourth proportional to 947.68, 1,421.40 and 384.88 is: 577.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.68 : 1,421.40 = 384.88 : x
  2. Step 2: Convert to fraction form
    947.68/1,421.40 = 384.88/x
  3. Step 3: Cross multiply
    947.68x = 1,421.40 × 384.88
  4. Step 4: Simplify right side
    947.68x = 547,068.43
  5. Step 5: Solve for x
    x = 547,068.43/947.68
  6. Step 6: Final answer
    x = 577.27

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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.