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Finding the Fourth Proportional to 959.70, 1,440.75 and 915.57

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Solution

The fourth proportional to 959.70, 1,440.75 and 915.57 is: 1,374.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.70 : 1,440.75 = 915.57 : x
  2. Step 2: Convert to fraction form
    959.70/1,440.75 = 915.57/x
  3. Step 3: Cross multiply
    959.70x = 1,440.75 × 915.57
  4. Step 4: Simplify right side
    959.70x = 1,319,107.48
  5. Step 5: Solve for x
    x = 1,319,107.48/959.70
  6. Step 6: Final answer
    x = 1,374.50

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1.5x scale

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.