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Finding the Fourth Proportional to 771.71, 1,064.95 and 440.15

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Solution

The fourth proportional to 771.71, 1,064.95 and 440.15 is: 607.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.71 : 1,064.95 = 440.15 : x
  2. Step 2: Convert to fraction form
    771.71/1,064.95 = 440.15/x
  3. Step 3: Cross multiply
    771.71x = 1,064.95 × 440.15
  4. Step 4: Simplify right side
    771.71x = 468,731.32
  5. Step 5: Solve for x
    x = 468,731.32/771.71
  6. Step 6: Final answer
    x = 607.40

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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.