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Finding the Fourth Proportional to 671.61, 1,007.55 and 346.89

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Solution

The fourth proportional to 671.61, 1,007.55 and 346.89 is: 520.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.61 : 1,007.55 = 346.89 : x
  2. Step 2: Convert to fraction form
    671.61/1,007.55 = 346.89/x
  3. Step 3: Cross multiply
    671.61x = 1,007.55 × 346.89
  4. Step 4: Simplify right side
    671.61x = 349,509.02
  5. Step 5: Solve for x
    x = 349,509.02/671.61
  6. Step 6: Final answer
    x = 520.40

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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.