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Finding the Fourth Proportional to 663,316, 915,400.78 and 376,884.60

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Solution

The fourth proportional to 663,316, 915,400.78 and 376,884.60 is: 520,114.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,316 : 915,400.78 = 376,884.60 : x
  2. Step 2: Convert to fraction form
    663,316/915,400.78 = 376,884.60/x
  3. Step 3: Cross multiply
    663,316x = 915,400.78 × 376,884.60
  4. Step 4: Simplify right side
    663,316x = 345,000,456,809.99
  5. Step 5: Solve for x
    x = 345,000,456,809.99/663,316
  6. Step 6: Final answer
    x = 520,114.78

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1.5x scale

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.