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Finding the Fourth Proportional to 145,655.90, 218,483.85 and 86,558.30

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Solution

The fourth proportional to 145,655.90, 218,483.85 and 86,558.30 is: 129,837.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,655.90 : 218,483.85 = 86,558.30 : x
  2. Step 2: Convert to fraction form
    145,655.90/218,483.85 = 86,558.30/x
  3. Step 3: Cross multiply
    145,655.90x = 218,483.85 × 86,558.30
  4. Step 4: Simplify right side
    145,655.90x = 18,911,590,633.46
  5. Step 5: Solve for x
    x = 18,911,590,633.46/145,655.90
  6. Step 6: Final answer
    x = 129,837.45

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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.