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Finding the Fourth Proportional to 205,859.90, 308,818.65 and 87,530.30

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Solution

The fourth proportional to 205,859.90, 308,818.65 and 87,530.30 is: 131,307.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,859.90 : 308,818.65 = 87,530.30 : x
  2. Step 2: Convert to fraction form
    205,859.90/308,818.65 = 87,530.30/x
  3. Step 3: Cross multiply
    205,859.90x = 308,818.65 × 87,530.30
  4. Step 4: Simplify right side
    205,859.90x = 27,030,989,080.10
  5. Step 5: Solve for x
    x = 27,030,989,080.10/205,859.90
  6. Step 6: Final answer
    x = 131,307.70

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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.