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Finding the Fourth Proportional to 1,080.95, 1,490.65 and 655.47

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Solution

The fourth proportional to 1,080.95, 1,490.65 and 655.47 is: 903.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.95 : 1,490.65 = 655.47 : x
  2. Step 2: Convert to fraction form
    1,080.95/1,490.65 = 655.47/x
  3. Step 3: Cross multiply
    1,080.95x = 1,490.65 × 655.47
  4. Step 4: Simplify right side
    1,080.95x = 977,074.72
  5. Step 5: Solve for x
    x = 977,074.72/1,080.95
  6. Step 6: Final answer
    x = 903.91

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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.