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Finding the Fourth Proportional to 687,752.40, 1,031,774.40 and 207,940.80

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Solution

The fourth proportional to 687,752.40, 1,031,774.40 and 207,940.80 is: 311,955.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,752.40 : 1,031,774.40 = 207,940.80 : x
  2. Step 2: Convert to fraction form
    687,752.40/1,031,774.40 = 207,940.80/x
  3. Step 3: Cross multiply
    687,752.40x = 1,031,774.40 × 207,940.80
  4. Step 4: Simplify right side
    687,752.40x = 214,547,994,155.52
  5. Step 5: Solve for x
    x = 214,547,994,155.52/687,752.40
  6. Step 6: Final answer
    x = 311,955.28

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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.