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Finding the Fourth Proportional to 917.16, 1,264.32 and 668.76

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Solution

The fourth proportional to 917.16, 1,264.32 and 668.76 is: 921.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.16 : 1,264.32 = 668.76 : x
  2. Step 2: Convert to fraction form
    917.16/1,264.32 = 668.76/x
  3. Step 3: Cross multiply
    917.16x = 1,264.32 × 668.76
  4. Step 4: Simplify right side
    917.16x = 845,526.64
  5. Step 5: Solve for x
    x = 845,526.64/917.16
  6. Step 6: Final answer
    x = 921.90

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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.