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Finding the Fourth Proportional to 1,290,336, 1,780,663.68 and 725,088

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Solution

The fourth proportional to 1,290,336, 1,780,663.68 and 725,088 is: 1,000,621.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290,336 : 1,780,663.68 = 725,088 : x
  2. Step 2: Convert to fraction form
    1,290,336/1,780,663.68 = 725,088/x
  3. Step 3: Cross multiply
    1,290,336x = 1,780,663.68 × 725,088
  4. Step 4: Simplify right side
    1,290,336x = 1,291,137,866,403.84
  5. Step 5: Solve for x
    x = 1,291,137,866,403.84/1,290,336
  6. Step 6: Final answer
    x = 1,000,621.44

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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.