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Finding the Fourth Proportional to 390,012.40, 585,018.60 and 153,362.80

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Solution

The fourth proportional to 390,012.40, 585,018.60 and 153,362.80 is: 230,044.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,012.40 : 585,018.60 = 153,362.80 : x
  2. Step 2: Convert to fraction form
    390,012.40/585,018.60 = 153,362.80/x
  3. Step 3: Cross multiply
    390,012.40x = 585,018.60 × 153,362.80
  4. Step 4: Simplify right side
    390,012.40x = 89,720,090,548.08
  5. Step 5: Solve for x
    x = 89,720,090,548.08/390,012.40
  6. Step 6: Final answer
    x = 230,044.20

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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.