Home / 1,689.42-2,331.09-981.35

Finding the Fourth Proportional to 1,689.42, 2,331.09 and 981.35

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Solution

The fourth proportional to 1,689.42, 2,331.09 and 981.35 is: 1,354.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.42 : 2,331.09 = 981.35 : x
  2. Step 2: Convert to fraction form
    1,689.42/2,331.09 = 981.35/x
  3. Step 3: Cross multiply
    1,689.42x = 2,331.09 × 981.35
  4. Step 4: Simplify right side
    1,689.42x = 2,287,612.26
  5. Step 5: Solve for x
    x = 2,287,612.26/1,689.42
  6. Step 6: Final answer
    x = 1,354.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.