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Finding the Fourth Proportional to 716,248.40, 988,423.26 and 393,983

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Solution

The fourth proportional to 716,248.40, 988,423.26 and 393,983 is: 543,696.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,248.40 : 988,423.26 = 393,983 : x
  2. Step 2: Convert to fraction form
    716,248.40/988,423.26 = 393,983/x
  3. Step 3: Cross multiply
    716,248.40x = 988,423.26 × 393,983
  4. Step 4: Simplify right side
    716,248.40x = 389,421,961,244.58
  5. Step 5: Solve for x
    x = 389,421,961,244.58/716,248.40
  6. Step 6: Final answer
    x = 543,696.80

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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.