Home / 645,145.56-890,138.16-390,447.54

Finding the Fourth Proportional to 645,145.56, 890,138.16 and 390,447.54

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Solution

The fourth proportional to 645,145.56, 890,138.16 and 390,447.54 is: 538,719.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,145.56 : 890,138.16 = 390,447.54 : x
  2. Step 2: Convert to fraction form
    645,145.56/890,138.16 = 390,447.54/x
  3. Step 3: Cross multiply
    645,145.56x = 890,138.16 × 390,447.54
  4. Step 4: Simplify right side
    645,145.56x = 347,552,254,832.13
  5. Step 5: Solve for x
    x = 347,552,254,832.13/645,145.56
  6. Step 6: Final answer
    x = 538,719.13

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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.