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Finding the Fourth Proportional to 390,851.20, 548,297.60 and 390,851.20

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Solution

The fourth proportional to 390,851.20, 548,297.60 and 390,851.20 is: 548,297.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,851.20 : 548,297.60 = 390,851.20 : x
  2. Step 2: Convert to fraction form
    390,851.20/548,297.60 = 390,851.20/x
  3. Step 3: Cross multiply
    390,851.20x = 548,297.60 × 390,851.20
  4. Step 4: Simplify right side
    390,851.20x = 214,302,774,917.12
  5. Step 5: Solve for x
    x = 214,302,774,917.12/390,851.20
  6. Step 6: Final answer
    x = 548,297.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.