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Finding the Fourth Proportional to 1,918,916.65, 2,878,369.30 and 781,410.97

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Solution

The fourth proportional to 1,918,916.65, 2,878,369.30 and 781,410.97 is: 1,172,114.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918,916.65 : 2,878,369.30 = 781,410.97 : x
  2. Step 2: Convert to fraction form
    1,918,916.65/2,878,369.30 = 781,410.97/x
  3. Step 3: Cross multiply
    1,918,916.65x = 2,878,369.30 × 781,410.97
  4. Step 4: Simplify right side
    1,918,916.65x = 2,249,189,346,731.22
  5. Step 5: Solve for x
    x = 2,249,189,346,731.22/1,918,916.65
  6. Step 6: Final answer
    x = 1,172,114.14

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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.