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Finding the Fourth Proportional to 407,720.40, 611,580.60 and 257,145.45

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Solution

The fourth proportional to 407,720.40, 611,580.60 and 257,145.45 is: 385,718.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,720.40 : 611,580.60 = 257,145.45 : x
  2. Step 2: Convert to fraction form
    407,720.40/611,580.60 = 257,145.45/x
  3. Step 3: Cross multiply
    407,720.40x = 611,580.60 × 257,145.45
  4. Step 4: Simplify right side
    407,720.40x = 157,265,168,598.27
  5. Step 5: Solve for x
    x = 157,265,168,598.27/407,720.40
  6. Step 6: Final answer
    x = 385,718.18

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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.