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Finding the Fourth Proportional to 1,405,643.76, 1,939,788 and 761,069.52

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Solution

The fourth proportional to 1,405,643.76, 1,939,788 and 761,069.52 is: 1,050,275.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405,643.76 : 1,939,788 = 761,069.52 : x
  2. Step 2: Convert to fraction form
    1,405,643.76/1,939,788 = 761,069.52/x
  3. Step 3: Cross multiply
    1,405,643.76x = 1,939,788 × 761,069.52
  4. Step 4: Simplify right side
    1,405,643.76x = 1,476,313,522,061.76
  5. Step 5: Solve for x
    x = 1,476,313,522,061.76/1,405,643.76
  6. Step 6: Final answer
    x = 1,050,275.73

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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.