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Finding the Fourth Proportional to 1,399,438.84, 1,931,821.47 and 940,819.40

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Solution

The fourth proportional to 1,399,438.84, 1,931,821.47 and 940,819.40 is: 1,298,731.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399,438.84 : 1,931,821.47 = 940,819.40 : x
  2. Step 2: Convert to fraction form
    1,399,438.84/1,931,821.47 = 940,819.40/x
  3. Step 3: Cross multiply
    1,399,438.84x = 1,931,821.47 × 940,819.40
  4. Step 4: Simplify right side
    1,399,438.84x = 1,817,495,111,608.42
  5. Step 5: Solve for x
    x = 1,817,495,111,608.42/1,399,438.84
  6. Step 6: Final answer
    x = 1,298,731.37

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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.