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Finding the Fourth Proportional to 677.28, 934.74 and 491.40

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Solution

The fourth proportional to 677.28, 934.74 and 491.40 is: 678.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.28 : 934.74 = 491.40 : x
  2. Step 2: Convert to fraction form
    677.28/934.74 = 491.40/x
  3. Step 3: Cross multiply
    677.28x = 934.74 × 491.40
  4. Step 4: Simplify right side
    677.28x = 459,331.24
  5. Step 5: Solve for x
    x = 459,331.24/677.28
  6. Step 6: Final answer
    x = 678.20

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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.