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Finding the Fourth Proportional to 1,125.70, 1,681.86 and 1,087.42

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Solution

The fourth proportional to 1,125.70, 1,681.86 and 1,087.42 is: 1,624.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.70 : 1,681.86 = 1,087.42 : x
  2. Step 2: Convert to fraction form
    1,125.70/1,681.86 = 1,087.42/x
  3. Step 3: Cross multiply
    1,125.70x = 1,681.86 × 1,087.42
  4. Step 4: Simplify right side
    1,125.70x = 1,828,888.20
  5. Step 5: Solve for x
    x = 1,828,888.20/1,125.70
  6. Step 6: Final answer
    x = 1,624.67

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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.