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Finding the Fourth Proportional to 760.17, 1,139.43 and 348.69

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Solution

The fourth proportional to 760.17, 1,139.43 and 348.69 is: 522.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.17 : 1,139.43 = 348.69 : x
  2. Step 2: Convert to fraction form
    760.17/1,139.43 = 348.69/x
  3. Step 3: Cross multiply
    760.17x = 1,139.43 × 348.69
  4. Step 4: Simplify right side
    760.17x = 397,307.85
  5. Step 5: Solve for x
    x = 397,307.85/760.17
  6. Step 6: Final answer
    x = 522.66

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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.