Home / 1,680.69-2,319.21-972.39

Finding the Fourth Proportional to 1,680.69, 2,319.21 and 972.39

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Solution

The fourth proportional to 1,680.69, 2,319.21 and 972.39 is: 1,341.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.69 : 2,319.21 = 972.39 : x
  2. Step 2: Convert to fraction form
    1,680.69/2,319.21 = 972.39/x
  3. Step 3: Cross multiply
    1,680.69x = 2,319.21 × 972.39
  4. Step 4: Simplify right side
    1,680.69x = 2,255,176.61
  5. Step 5: Solve for x
    x = 2,255,176.61/1,680.69
  6. Step 6: Final answer
    x = 1,341.82

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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.