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Finding the Fourth Proportional to 1,178,856, 1,626,821.28 and 642,312

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Solution

The fourth proportional to 1,178,856, 1,626,821.28 and 642,312 is: 886,390.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178,856 : 1,626,821.28 = 642,312 : x
  2. Step 2: Convert to fraction form
    1,178,856/1,626,821.28 = 642,312/x
  3. Step 3: Cross multiply
    1,178,856x = 1,626,821.28 × 642,312
  4. Step 4: Simplify right side
    1,178,856x = 1,044,926,829,999.36
  5. Step 5: Solve for x
    x = 1,044,926,829,999.36/1,178,856
  6. Step 6: Final answer
    x = 886,390.56

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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.