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Finding the Fourth Proportional to 1,387.47, 1,914.80 and 798.06

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Solution

The fourth proportional to 1,387.47, 1,914.80 and 798.06 is: 1,101.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.47 : 1,914.80 = 798.06 : x
  2. Step 2: Convert to fraction form
    1,387.47/1,914.80 = 798.06/x
  3. Step 3: Cross multiply
    1,387.47x = 1,914.80 × 798.06
  4. Step 4: Simplify right side
    1,387.47x = 1,528,125.29
  5. Step 5: Solve for x
    x = 1,528,125.29/1,387.47
  6. Step 6: Final answer
    x = 1,101.38

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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.