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Finding the Fourth Proportional to 420,428.70, 630,643.05 and 302,330.70

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Solution

The fourth proportional to 420,428.70, 630,643.05 and 302,330.70 is: 453,496.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,428.70 : 630,643.05 = 302,330.70 : x
  2. Step 2: Convert to fraction form
    420,428.70/630,643.05 = 302,330.70/x
  3. Step 3: Cross multiply
    420,428.70x = 630,643.05 × 302,330.70
  4. Step 4: Simplify right side
    420,428.70x = 190,662,754,756.64
  5. Step 5: Solve for x
    x = 190,662,754,756.64/420,428.70
  6. Step 6: Final answer
    x = 453,496.05

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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.