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Finding the Fourth Proportional to 1,045.31, 1,567.65 and 428.69

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Solution

The fourth proportional to 1,045.31, 1,567.65 and 428.69 is: 642.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,045.31 : 1,567.65 = 428.69 : x
  2. Step 2: Convert to fraction form
    1,045.31/1,567.65 = 428.69/x
  3. Step 3: Cross multiply
    1,045.31x = 1,567.65 × 428.69
  4. Step 4: Simplify right side
    1,045.31x = 672,041.41
  5. Step 5: Solve for x
    x = 672,041.41/1,045.31
  6. Step 6: Final answer
    x = 642.91

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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.