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Finding the Fourth Proportional to 915.88, 1,263.48 and 705.68

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Solution

The fourth proportional to 915.88, 1,263.48 and 705.68 is: 973.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.88 : 1,263.48 = 705.68 : x
  2. Step 2: Convert to fraction form
    915.88/1,263.48 = 705.68/x
  3. Step 3: Cross multiply
    915.88x = 1,263.48 × 705.68
  4. Step 4: Simplify right side
    915.88x = 891,612.57
  5. Step 5: Solve for x
    x = 891,612.57/915.88
  6. Step 6: Final answer
    x = 973.50

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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.