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Finding the Fourth Proportional to 1,411.80, 1,948.77 and 971.16

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Solution

The fourth proportional to 1,411.80, 1,948.77 and 971.16 is: 1,340.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,411.80 : 1,948.77 = 971.16 : x
  2. Step 2: Convert to fraction form
    1,411.80/1,948.77 = 971.16/x
  3. Step 3: Cross multiply
    1,411.80x = 1,948.77 × 971.16
  4. Step 4: Simplify right side
    1,411.80x = 1,892,567.47
  5. Step 5: Solve for x
    x = 1,892,567.47/1,411.80
  6. Step 6: Final answer
    x = 1,340.54

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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.