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Finding the Fourth Proportional to 420,095.60, 630,143.40 and 354,485.60

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Solution

The fourth proportional to 420,095.60, 630,143.40 and 354,485.60 is: 531,728.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,095.60 : 630,143.40 = 354,485.60 : x
  2. Step 2: Convert to fraction form
    420,095.60/630,143.40 = 354,485.60/x
  3. Step 3: Cross multiply
    420,095.60x = 630,143.40 × 354,485.60
  4. Step 4: Simplify right side
    420,095.60x = 223,376,761,235.04
  5. Step 5: Solve for x
    x = 223,376,761,235.04/420,095.60
  6. Step 6: Final answer
    x = 531,728.40

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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.