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Finding the Fourth Proportional to 420,123.40, 630,185.10 and 420,123.40

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Solution

The fourth proportional to 420,123.40, 630,185.10 and 420,123.40 is: 630,185.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,123.40 : 630,185.10 = 420,123.40 : x
  2. Step 2: Convert to fraction form
    420,123.40/630,185.10 = 420,123.40/x
  3. Step 3: Cross multiply
    420,123.40x = 630,185.10 × 420,123.40
  4. Step 4: Simplify right side
    420,123.40x = 264,755,506,841.34
  5. Step 5: Solve for x
    x = 264,755,506,841.34/420,123.40
  6. Step 6: Final answer
    x = 630,185.10

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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.