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Finding the Fourth Proportional to 879.99, 1,207.92 and 778.18

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Solution

The fourth proportional to 879.99, 1,207.92 and 778.18 is: 1,068.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.99 : 1,207.92 = 778.18 : x
  2. Step 2: Convert to fraction form
    879.99/1,207.92 = 778.18/x
  3. Step 3: Cross multiply
    879.99x = 1,207.92 × 778.18
  4. Step 4: Simplify right side
    879.99x = 939,971.20
  5. Step 5: Solve for x
    x = 939,971.20/879.99
  6. Step 6: Final answer
    x = 1,068.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.