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Finding the Fourth Proportional to 718,542.40, 1,075,970.40 and 685,364.80

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Solution

The fourth proportional to 718,542.40, 1,075,970.40 and 685,364.80 is: 1,026,289.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,542.40 : 1,075,970.40 = 685,364.80 : x
  2. Step 2: Convert to fraction form
    718,542.40/1,075,970.40 = 685,364.80/x
  3. Step 3: Cross multiply
    718,542.40x = 1,075,970.40 × 685,364.80
  4. Step 4: Simplify right side
    718,542.40x = 737,432,238,001.92
  5. Step 5: Solve for x
    x = 737,432,238,001.92/718,542.40
  6. Step 6: Final answer
    x = 1,026,289.11

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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.