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Finding the Fourth Proportional to 840.80, 1,159.32 and 578.96

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Solution

The fourth proportional to 840.80, 1,159.32 and 578.96 is: 798.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.80 : 1,159.32 = 578.96 : x
  2. Step 2: Convert to fraction form
    840.80/1,159.32 = 578.96/x
  3. Step 3: Cross multiply
    840.80x = 1,159.32 × 578.96
  4. Step 4: Simplify right side
    840.80x = 671,199.91
  5. Step 5: Solve for x
    x = 671,199.91/840.80
  6. Step 6: Final answer
    x = 798.29

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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.