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Finding the Fourth Proportional to 868,403.60, 1,302,605.40 and 781,312.40

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Solution

The fourth proportional to 868,403.60, 1,302,605.40 and 781,312.40 is: 1,171,968.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    868,403.60 : 1,302,605.40 = 781,312.40 : x
  2. Step 2: Convert to fraction form
    868,403.60/1,302,605.40 = 781,312.40/x
  3. Step 3: Cross multiply
    868,403.60x = 1,302,605.40 × 781,312.40
  4. Step 4: Simplify right side
    868,403.60x = 1,017,741,751,326.96
  5. Step 5: Solve for x
    x = 1,017,741,751,326.96/868,403.60
  6. Step 6: Final answer
    x = 1,171,968.60

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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.