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Finding the Fourth Proportional to 420,156.80, 630,235.20 and 346,345.55

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Solution

The fourth proportional to 420,156.80, 630,235.20 and 346,345.55 is: 519,518.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,156.80 : 630,235.20 = 346,345.55 : x
  2. Step 2: Convert to fraction form
    420,156.80/630,235.20 = 346,345.55/x
  3. Step 3: Cross multiply
    420,156.80x = 630,235.20 × 346,345.55
  4. Step 4: Simplify right side
    420,156.80x = 218,279,156,973.36
  5. Step 5: Solve for x
    x = 218,279,156,973.36/420,156.80
  6. Step 6: Final answer
    x = 519,518.33

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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.