Home / 1,438.40-2,157.78-707.36

Finding the Fourth Proportional to 1,438.40, 2,157.78 and 707.36

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Solution

The fourth proportional to 1,438.40, 2,157.78 and 707.36 is: 1,061.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.40 : 2,157.78 = 707.36 : x
  2. Step 2: Convert to fraction form
    1,438.40/2,157.78 = 707.36/x
  3. Step 3: Cross multiply
    1,438.40x = 2,157.78 × 707.36
  4. Step 4: Simplify right side
    1,438.40x = 1,526,327.26
  5. Step 5: Solve for x
    x = 1,526,327.26/1,438.40
  6. Step 6: Final answer
    x = 1,061.13

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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.