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Finding the Fourth Proportional to 1,985,685.64, 2,975,712.59 and 831,688.97

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Solution

The fourth proportional to 1,985,685.64, 2,975,712.59 and 831,688.97 is: 1,246,354.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985,685.64 : 2,975,712.59 = 831,688.97 : x
  2. Step 2: Convert to fraction form
    1,985,685.64/2,975,712.59 = 831,688.97/x
  3. Step 3: Cross multiply
    1,985,685.64x = 2,975,712.59 × 831,688.97
  4. Step 4: Simplify right side
    1,985,685.64x = 2,474,867,326,193.79
  5. Step 5: Solve for x
    x = 2,474,867,326,193.79/1,985,685.64
  6. Step 6: Final answer
    x = 1,246,354.04

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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.