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Finding the Fourth Proportional to 1,768.78, 2,440.95 and 972.12

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Solution

The fourth proportional to 1,768.78, 2,440.95 and 972.12 is: 1,341.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,768.78 : 2,440.95 = 972.12 : x
  2. Step 2: Convert to fraction form
    1,768.78/2,440.95 = 972.12/x
  3. Step 3: Cross multiply
    1,768.78x = 2,440.95 × 972.12
  4. Step 4: Simplify right side
    1,768.78x = 2,372,899.96
  5. Step 5: Solve for x
    x = 2,372,899.96/1,768.78
  6. Step 6: Final answer
    x = 1,341.55

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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.