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Finding the Fourth Proportional to 879,643.80, 1,319,465.70 and 771,168.60

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Solution

The fourth proportional to 879,643.80, 1,319,465.70 and 771,168.60 is: 1,156,752.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,643.80 : 1,319,465.70 = 771,168.60 : x
  2. Step 2: Convert to fraction form
    879,643.80/1,319,465.70 = 771,168.60/x
  3. Step 3: Cross multiply
    879,643.80x = 1,319,465.70 × 771,168.60
  4. Step 4: Simplify right side
    879,643.80x = 1,017,530,516,617.02
  5. Step 5: Solve for x
    x = 1,017,530,516,617.02/879,643.80
  6. Step 6: Final answer
    x = 1,156,752.90

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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.