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Finding the Fourth Proportional to 509,421.35, 702,999.61 and 279,994.12

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Solution

The fourth proportional to 509,421.35, 702,999.61 and 279,994.12 is: 386,390.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,421.35 : 702,999.61 = 279,994.12 : x
  2. Step 2: Convert to fraction form
    509,421.35/702,999.61 = 279,994.12/x
  3. Step 3: Cross multiply
    509,421.35x = 702,999.61 × 279,994.12
  4. Step 4: Simplify right side
    509,421.35x = 196,835,754,704.81
  5. Step 5: Solve for x
    x = 196,835,754,704.81/509,421.35
  6. Step 6: Final answer
    x = 386,390.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.