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Finding the Fourth Proportional to 391,071.21, 539,399.47 and 358,909.49

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Solution

The fourth proportional to 391,071.21, 539,399.47 and 358,909.49 is: 495,039.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,071.21 : 539,399.47 = 358,909.49 : x
  2. Step 2: Convert to fraction form
    391,071.21/539,399.47 = 358,909.49/x
  3. Step 3: Cross multiply
    391,071.21x = 539,399.47 × 358,909.49
  4. Step 4: Simplify right side
    391,071.21x = 193,595,588,683.97
  5. Step 5: Solve for x
    x = 193,595,588,683.97/391,071.21
  6. Step 6: Final answer
    x = 495,039.22

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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.