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Finding the Fourth Proportional to 508,085.40, 762,128.10 and 425,416.80

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Solution

The fourth proportional to 508,085.40, 762,128.10 and 425,416.80 is: 638,125.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    508,085.40 : 762,128.10 = 425,416.80 : x
  2. Step 2: Convert to fraction form
    508,085.40/762,128.10 = 425,416.80/x
  3. Step 3: Cross multiply
    508,085.40x = 762,128.10 × 425,416.80
  4. Step 4: Simplify right side
    508,085.40x = 324,222,097,492.08
  5. Step 5: Solve for x
    x = 324,222,097,492.08/508,085.40
  6. Step 6: Final answer
    x = 638,125.20

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Double scale
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Similar ratio
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1.5x scale

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.