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Finding the Fourth Proportional to 86,656.90, 121,582.10 and 86,656.90

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Solution

The fourth proportional to 86,656.90, 121,582.10 and 86,656.90 is: 121,582.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,656.90 : 121,582.10 = 86,656.90 : x
  2. Step 2: Convert to fraction form
    86,656.90/121,582.10 = 86,656.90/x
  3. Step 3: Cross multiply
    86,656.90x = 121,582.10 × 86,656.90
  4. Step 4: Simplify right side
    86,656.90x = 10,535,927,881.49
  5. Step 5: Solve for x
    x = 10,535,927,881.49/86,656.90
  6. Step 6: Final answer
    x = 121,582.10

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.