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Finding the Fourth Proportional to 926.65, 1,277.91 and 678.18

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Solution

The fourth proportional to 926.65, 1,277.91 and 678.18 is: 935.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.65 : 1,277.91 = 678.18 : x
  2. Step 2: Convert to fraction form
    926.65/1,277.91 = 678.18/x
  3. Step 3: Cross multiply
    926.65x = 1,277.91 × 678.18
  4. Step 4: Simplify right side
    926.65x = 866,657.80
  5. Step 5: Solve for x
    x = 866,657.80/926.65
  6. Step 6: Final answer
    x = 935.26

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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.