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Finding the Fourth Proportional to 947.20, 1,307.12 and 554.24

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Solution

The fourth proportional to 947.20, 1,307.12 and 554.24 is: 764.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.20 : 1,307.12 = 554.24 : x
  2. Step 2: Convert to fraction form
    947.20/1,307.12 = 554.24/x
  3. Step 3: Cross multiply
    947.20x = 1,307.12 × 554.24
  4. Step 4: Simplify right side
    947.20x = 724,458.19
  5. Step 5: Solve for x
    x = 724,458.19/947.20
  6. Step 6: Final answer
    x = 764.84

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1.5x scale

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.