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Finding the Fourth Proportional to 1,387,894.94, 1,914,708.48 and 929,157.11

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Solution

The fourth proportional to 1,387,894.94, 1,914,708.48 and 929,157.11 is: 1,281,844.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387,894.94 : 1,914,708.48 = 929,157.11 : x
  2. Step 2: Convert to fraction form
    1,387,894.94/1,914,708.48 = 929,157.11/x
  3. Step 3: Cross multiply
    1,387,894.94x = 1,914,708.48 × 929,157.11
  4. Step 4: Simplify right side
    1,387,894.94x = 1,779,064,997,769.29
  5. Step 5: Solve for x
    x = 1,779,064,997,769.29/1,387,894.94
  6. Step 6: Final answer
    x = 1,281,844.14

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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.