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Finding the Fourth Proportional to 865,110.80, 1,298,978.40 and 665,656.40

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Solution

The fourth proportional to 865,110.80, 1,298,978.40 and 665,656.40 is: 999,494.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,110.80 : 1,298,978.40 = 665,656.40 : x
  2. Step 2: Convert to fraction form
    865,110.80/1,298,978.40 = 665,656.40/x
  3. Step 3: Cross multiply
    865,110.80x = 1,298,978.40 × 665,656.40
  4. Step 4: Simplify right side
    865,110.80x = 864,673,285,421.76
  5. Step 5: Solve for x
    x = 864,673,285,421.76/865,110.80
  6. Step 6: Final answer
    x = 999,494.27

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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.