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Finding the Fourth Proportional to 420,521.92, 630,549.52 and 139,886.08

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Solution

The fourth proportional to 420,521.92, 630,549.52 and 139,886.08 is: 209,751.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,521.92 : 630,549.52 = 139,886.08 : x
  2. Step 2: Convert to fraction form
    420,521.92/630,549.52 = 139,886.08/x
  3. Step 3: Cross multiply
    420,521.92x = 630,549.52 × 139,886.08
  4. Step 4: Simplify right side
    420,521.92x = 88,205,100,598.68
  5. Step 5: Solve for x
    x = 88,205,100,598.68/420,521.92
  6. Step 6: Final answer
    x = 209,751.49

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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.