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Finding the Fourth Proportional to 86,590.40, 129,626.40 and 77,259.20

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Solution

The fourth proportional to 86,590.40, 129,626.40 and 77,259.20 is: 115,657.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,590.40 : 129,626.40 = 77,259.20 : x
  2. Step 2: Convert to fraction form
    86,590.40/129,626.40 = 77,259.20/x
  3. Step 3: Cross multiply
    86,590.40x = 129,626.40 × 77,259.20
  4. Step 4: Simplify right side
    86,590.40x = 10,014,831,962.88
  5. Step 5: Solve for x
    x = 10,014,831,962.88/86,590.40
  6. Step 6: Final answer
    x = 115,657.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.