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Finding the Fourth Proportional to 867,985.80, 1,301,978.70 and 728,017.80

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Solution

The fourth proportional to 867,985.80, 1,301,978.70 and 728,017.80 is: 1,092,026.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    867,985.80 : 1,301,978.70 = 728,017.80 : x
  2. Step 2: Convert to fraction form
    867,985.80/1,301,978.70 = 728,017.80/x
  3. Step 3: Cross multiply
    867,985.80x = 1,301,978.70 × 728,017.80
  4. Step 4: Simplify right side
    867,985.80x = 947,863,668,820.86
  5. Step 5: Solve for x
    x = 947,863,668,820.86/867,985.80
  6. Step 6: Final answer
    x = 1,092,026.70

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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.