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Finding the Fourth Proportional to 390,015.60, 585,023.40 and 345,692.40

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Solution

The fourth proportional to 390,015.60, 585,023.40 and 345,692.40 is: 518,538.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,015.60 : 585,023.40 = 345,692.40 : x
  2. Step 2: Convert to fraction form
    390,015.60/585,023.40 = 345,692.40/x
  3. Step 3: Cross multiply
    390,015.60x = 585,023.40 × 345,692.40
  4. Step 4: Simplify right side
    390,015.60x = 202,238,143,202.16
  5. Step 5: Solve for x
    x = 202,238,143,202.16/390,015.60
  6. Step 6: Final answer
    x = 518,538.60

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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.