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Finding the Fourth Proportional to 1,387.07, 1,914.15 and 766.07

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Solution

The fourth proportional to 1,387.07, 1,914.15 and 766.07 is: 1,057.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.07 : 1,914.15 = 766.07 : x
  2. Step 2: Convert to fraction form
    1,387.07/1,914.15 = 766.07/x
  3. Step 3: Cross multiply
    1,387.07x = 1,914.15 × 766.07
  4. Step 4: Simplify right side
    1,387.07x = 1,466,359.49
  5. Step 5: Solve for x
    x = 1,466,359.49/1,387.07
  6. Step 6: Final answer
    x = 1,057.17

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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.