Home / 1,216,818.20-1,679,433.76-781,779.40

Finding the Fourth Proportional to 1,216,818.20, 1,679,433.76 and 781,779.40

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Solution

The fourth proportional to 1,216,818.20, 1,679,433.76 and 781,779.40 is: 1,078,999.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216,818.20 : 1,679,433.76 = 781,779.40 : x
  2. Step 2: Convert to fraction form
    1,216,818.20/1,679,433.76 = 781,779.40/x
  3. Step 3: Cross multiply
    1,216,818.20x = 1,679,433.76 × 781,779.40
  4. Step 4: Simplify right side
    1,216,818.20x = 1,312,946,717,232.54
  5. Step 5: Solve for x
    x = 1,312,946,717,232.54/1,216,818.20
  6. Step 6: Final answer
    x = 1,078,999.90

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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.