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Finding the Fourth Proportional to 989.51, 1,474.56 and 931.08

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Solution

The fourth proportional to 989.51, 1,474.56 and 931.08 is: 1,387.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.51 : 1,474.56 = 931.08 : x
  2. Step 2: Convert to fraction form
    989.51/1,474.56 = 931.08/x
  3. Step 3: Cross multiply
    989.51x = 1,474.56 × 931.08
  4. Step 4: Simplify right side
    989.51x = 1,372,933.32
  5. Step 5: Solve for x
    x = 1,372,933.32/989.51
  6. Step 6: Final answer
    x = 1,387.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.