Home / 1,216,815.72-1,679,430.32-781,776.90

Finding the Fourth Proportional to 1,216,815.72, 1,679,430.32 and 781,776.90

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Solution

The fourth proportional to 1,216,815.72, 1,679,430.32 and 781,776.90 is: 1,078,996.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216,815.72 : 1,679,430.32 = 781,776.90 : x
  2. Step 2: Convert to fraction form
    1,216,815.72/1,679,430.32 = 781,776.90/x
  3. Step 3: Cross multiply
    1,216,815.72x = 1,679,430.32 × 781,776.90
  4. Step 4: Simplify right side
    1,216,815.72x = 1,312,939,829,335.61
  5. Step 5: Solve for x
    x = 1,312,939,829,335.61/1,216,815.72
  6. Step 6: Final answer
    x = 1,078,996.44

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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.