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Finding the Fourth Proportional to 1,221,312, 1,685,411.28 and 744,384

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Solution

The fourth proportional to 1,221,312, 1,685,411.28 and 744,384 is: 1,027,250.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221,312 : 1,685,411.28 = 744,384 : x
  2. Step 2: Convert to fraction form
    1,221,312/1,685,411.28 = 744,384/x
  3. Step 3: Cross multiply
    1,221,312x = 1,685,411.28 × 744,384
  4. Step 4: Simplify right side
    1,221,312x = 1,254,593,190,251.52
  5. Step 5: Solve for x
    x = 1,254,593,190,251.52/1,221,312
  6. Step 6: Final answer
    x = 1,027,250.36

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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.