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Finding the Fourth Proportional to 1,071.80, 1,607.70 and 998.90

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Solution

The fourth proportional to 1,071.80, 1,607.70 and 998.90 is: 1,498.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.80 : 1,607.70 = 998.90 : x
  2. Step 2: Convert to fraction form
    1,071.80/1,607.70 = 998.90/x
  3. Step 3: Cross multiply
    1,071.80x = 1,607.70 × 998.90
  4. Step 4: Simplify right side
    1,071.80x = 1,605,931.53
  5. Step 5: Solve for x
    x = 1,605,931.53/1,071.80
  6. Step 6: Final answer
    x = 1,498.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.