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Finding the Fourth Proportional to 1,672.13, 2,307.45 and 915.76

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Solution

The fourth proportional to 1,672.13, 2,307.45 and 915.76 is: 1,263.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,672.13 : 2,307.45 = 915.76 : x
  2. Step 2: Convert to fraction form
    1,672.13/2,307.45 = 915.76/x
  3. Step 3: Cross multiply
    1,672.13x = 2,307.45 × 915.76
  4. Step 4: Simplify right side
    1,672.13x = 2,113,072.75
  5. Step 5: Solve for x
    x = 2,113,072.75/1,672.13
  6. Step 6: Final answer
    x = 1,263.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.