Home / 1,319,970.75-1,979,990.31-421,411.74

Finding the Fourth Proportional to 1,319,970.75, 1,979,990.31 and 421,411.74

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Solution

The fourth proportional to 1,319,970.75, 1,979,990.31 and 421,411.74 is: 632,128.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319,970.75 : 1,979,990.31 = 421,411.74 : x
  2. Step 2: Convert to fraction form
    1,319,970.75/1,979,990.31 = 421,411.74/x
  3. Step 3: Cross multiply
    1,319,970.75x = 1,979,990.31 × 421,411.74
  4. Step 4: Simplify right side
    1,319,970.75x = 834,391,161,720.24
  5. Step 5: Solve for x
    x = 834,391,161,720.24/1,319,970.75
  6. Step 6: Final answer
    x = 632,128.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.