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Finding the Fourth Proportional to 389,590.90, 584,412.30 and 136,840.66

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Solution

The fourth proportional to 389,590.90, 584,412.30 and 136,840.66 is: 205,270.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,590.90 : 584,412.30 = 136,840.66 : x
  2. Step 2: Convert to fraction form
    389,590.90/584,412.30 = 136,840.66/x
  3. Step 3: Cross multiply
    389,590.90x = 584,412.30 × 136,840.66
  4. Step 4: Simplify right side
    389,590.90x = 79,971,364,844.12
  5. Step 5: Solve for x
    x = 79,971,364,844.12/389,590.90
  6. Step 6: Final answer
    x = 205,270.10

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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.