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Finding the Fourth Proportional to 915.80, 1,263.62 and 694.40

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Solution

The fourth proportional to 915.80, 1,263.62 and 694.40 is: 958.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.80 : 1,263.62 = 694.40 : x
  2. Step 2: Convert to fraction form
    915.80/1,263.62 = 694.40/x
  3. Step 3: Cross multiply
    915.80x = 1,263.62 × 694.40
  4. Step 4: Simplify right side
    915.80x = 877,457.73
  5. Step 5: Solve for x
    x = 877,457.73/915.80
  6. Step 6: Final answer
    x = 958.13

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1.5x scale

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.