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Finding the Fourth Proportional to 867,109.20, 1,300,663.80 and 778,754.40

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Solution

The fourth proportional to 867,109.20, 1,300,663.80 and 778,754.40 is: 1,168,131.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    867,109.20 : 1,300,663.80 = 778,754.40 : x
  2. Step 2: Convert to fraction form
    867,109.20/1,300,663.80 = 778,754.40/x
  3. Step 3: Cross multiply
    867,109.20x = 1,300,663.80 × 778,754.40
  4. Step 4: Simplify right side
    867,109.20x = 1,012,897,657,170.72
  5. Step 5: Solve for x
    x = 1,012,897,657,170.72/867,109.20
  6. Step 6: Final answer
    x = 1,168,131.60

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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.