Home / 1,331.72-1,985.84-1,239.40

Finding the Fourth Proportional to 1,331.72, 1,985.84 and 1,239.40

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Solution

The fourth proportional to 1,331.72, 1,985.84 and 1,239.40 is: 1,848.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.72 : 1,985.84 = 1,239.40 : x
  2. Step 2: Convert to fraction form
    1,331.72/1,985.84 = 1,239.40/x
  3. Step 3: Cross multiply
    1,331.72x = 1,985.84 × 1,239.40
  4. Step 4: Simplify right side
    1,331.72x = 2,461,250.10
  5. Step 5: Solve for x
    x = 2,461,250.10/1,331.72
  6. Step 6: Final answer
    x = 1,848.17

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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.