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Finding the Fourth Proportional to 840.88, 1,160.40 and 467.88

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Solution

The fourth proportional to 840.88, 1,160.40 and 467.88 is: 645.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.88 : 1,160.40 = 467.88 : x
  2. Step 2: Convert to fraction form
    840.88/1,160.40 = 467.88/x
  3. Step 3: Cross multiply
    840.88x = 1,160.40 × 467.88
  4. Step 4: Simplify right side
    840.88x = 542,927.95
  5. Step 5: Solve for x
    x = 542,927.95/840.88
  6. Step 6: Final answer
    x = 645.67

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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.