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Finding the Fourth Proportional to 278,812.88, 385,328.90 and 210,808.12

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Solution

The fourth proportional to 278,812.88, 385,328.90 and 210,808.12 is: 291,344.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,812.88 : 385,328.90 = 210,808.12 : x
  2. Step 2: Convert to fraction form
    278,812.88/385,328.90 = 210,808.12/x
  3. Step 3: Cross multiply
    278,812.88x = 385,328.90 × 210,808.12
  4. Step 4: Simplify right side
    278,812.88x = 81,230,460,091.06
  5. Step 5: Solve for x
    x = 81,230,460,091.06/278,812.88
  6. Step 6: Final answer
    x = 291,344.00

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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.