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Finding the Fourth Proportional to 916.75, 1,263.63 and 717.22

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Solution

The fourth proportional to 916.75, 1,263.63 and 717.22 is: 988.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.75 : 1,263.63 = 717.22 : x
  2. Step 2: Convert to fraction form
    916.75/1,263.63 = 717.22/x
  3. Step 3: Cross multiply
    916.75x = 1,263.63 × 717.22
  4. Step 4: Simplify right side
    916.75x = 906,300.71
  5. Step 5: Solve for x
    x = 906,300.71/916.75
  6. Step 6: Final answer
    x = 988.60

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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.