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Finding the Fourth Proportional to 1,260,916.61, 1,740,070.62 and 687,968.78

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Solution

The fourth proportional to 1,260,916.61, 1,740,070.62 and 687,968.78 is: 949,400.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260,916.61 : 1,740,070.62 = 687,968.78 : x
  2. Step 2: Convert to fraction form
    1,260,916.61/1,740,070.62 = 687,968.78/x
  3. Step 3: Cross multiply
    1,260,916.61x = 1,740,070.62 × 687,968.78
  4. Step 4: Simplify right side
    1,260,916.61x = 1,197,114,252,854.89
  5. Step 5: Solve for x
    x = 1,197,114,252,854.89/1,260,916.61
  6. Step 6: Final answer
    x = 949,400.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.