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Finding the Fourth Proportional to 1,391.11, 1,916.48 and 970.72

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Solution

The fourth proportional to 1,391.11, 1,916.48 and 970.72 is: 1,337.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.11 : 1,916.48 = 970.72 : x
  2. Step 2: Convert to fraction form
    1,391.11/1,916.48 = 970.72/x
  3. Step 3: Cross multiply
    1,391.11x = 1,916.48 × 970.72
  4. Step 4: Simplify right side
    1,391.11x = 1,860,363.10
  5. Step 5: Solve for x
    x = 1,860,363.10/1,391.11
  6. Step 6: Final answer
    x = 1,337.33

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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.