Home / 1,690.15-2,332.36-981.55

Finding the Fourth Proportional to 1,690.15, 2,332.36 and 981.55

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Solution

The fourth proportional to 1,690.15, 2,332.36 and 981.55 is: 1,354.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,690.15 : 2,332.36 = 981.55 : x
  2. Step 2: Convert to fraction form
    1,690.15/2,332.36 = 981.55/x
  3. Step 3: Cross multiply
    1,690.15x = 2,332.36 × 981.55
  4. Step 4: Simplify right side
    1,690.15x = 2,289,327.96
  5. Step 5: Solve for x
    x = 2,289,327.96/1,690.15
  6. Step 6: Final answer
    x = 1,354.51

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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.