Home / 1,570.90-2,167.17-981.70

Finding the Fourth Proportional to 1,570.90, 2,167.17 and 981.70

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Solution

The fourth proportional to 1,570.90, 2,167.17 and 981.70 is: 1,354.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.90 : 2,167.17 = 981.70 : x
  2. Step 2: Convert to fraction form
    1,570.90/2,167.17 = 981.70/x
  3. Step 3: Cross multiply
    1,570.90x = 2,167.17 × 981.70
  4. Step 4: Simplify right side
    1,570.90x = 2,127,510.79
  5. Step 5: Solve for x
    x = 2,127,510.79/1,570.90
  6. Step 6: Final answer
    x = 1,354.33

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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.