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Finding the Fourth Proportional to 1,020.32, 1,530.02 and 289.72

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Solution

The fourth proportional to 1,020.32, 1,530.02 and 289.72 is: 434.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.32 : 1,530.02 = 289.72 : x
  2. Step 2: Convert to fraction form
    1,020.32/1,530.02 = 289.72/x
  3. Step 3: Cross multiply
    1,020.32x = 1,530.02 × 289.72
  4. Step 4: Simplify right side
    1,020.32x = 443,277.39
  5. Step 5: Solve for x
    x = 443,277.39/1,020.32
  6. Step 6: Final answer
    x = 434.45

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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.