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Finding the Fourth Proportional to 1,878.60, 2,590.90 and 1,407.61

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Solution

The fourth proportional to 1,878.60, 2,590.90 and 1,407.61 is: 1,941.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,878.60 : 2,590.90 = 1,407.61 : x
  2. Step 2: Convert to fraction form
    1,878.60/2,590.90 = 1,407.61/x
  3. Step 3: Cross multiply
    1,878.60x = 2,590.90 × 1,407.61
  4. Step 4: Simplify right side
    1,878.60x = 3,646,966.75
  5. Step 5: Solve for x
    x = 3,646,966.75/1,878.60
  6. Step 6: Final answer
    x = 1,941.32

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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.