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Finding the Fourth Proportional to 1,339.65, 2,007.18 and 916.70

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Solution

The fourth proportional to 1,339.65, 2,007.18 and 916.70 is: 1,373.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.65 : 2,007.18 = 916.70 : x
  2. Step 2: Convert to fraction form
    1,339.65/2,007.18 = 916.70/x
  3. Step 3: Cross multiply
    1,339.65x = 2,007.18 × 916.70
  4. Step 4: Simplify right side
    1,339.65x = 1,839,971.87
  5. Step 5: Solve for x
    x = 1,839,971.87/1,339.65
  6. Step 6: Final answer
    x = 1,373.47

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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.