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Finding the Fourth Proportional to 885,643.80, 1,328,465.70 and 812,160.60

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Solution

The fourth proportional to 885,643.80, 1,328,465.70 and 812,160.60 is: 1,218,240.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    885,643.80 : 1,328,465.70 = 812,160.60 : x
  2. Step 2: Convert to fraction form
    885,643.80/1,328,465.70 = 812,160.60/x
  3. Step 3: Cross multiply
    885,643.80x = 1,328,465.70 × 812,160.60
  4. Step 4: Simplify right side
    885,643.80x = 1,078,927,499,991.42
  5. Step 5: Solve for x
    x = 1,078,927,499,991.42/885,643.80
  6. Step 6: Final answer
    x = 1,218,240.90

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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.