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Finding the Fourth Proportional to 434,574.80, 651,862.20 and 256,990.40

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Solution

The fourth proportional to 434,574.80, 651,862.20 and 256,990.40 is: 385,485.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    434,574.80 : 651,862.20 = 256,990.40 : x
  2. Step 2: Convert to fraction form
    434,574.80/651,862.20 = 256,990.40/x
  3. Step 3: Cross multiply
    434,574.80x = 651,862.20 × 256,990.40
  4. Step 4: Simplify right side
    434,574.80x = 167,522,327,522.88
  5. Step 5: Solve for x
    x = 167,522,327,522.88/434,574.80
  6. Step 6: Final answer
    x = 385,485.60

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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.