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Finding the Fourth Proportional to 390,656.40, 585,907.80 and 128,000.40

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Solution

The fourth proportional to 390,656.40, 585,907.80 and 128,000.40 is: 191,975.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,656.40 : 585,907.80 = 128,000.40 : x
  2. Step 2: Convert to fraction form
    390,656.40/585,907.80 = 128,000.40/x
  3. Step 3: Cross multiply
    390,656.40x = 585,907.80 × 128,000.40
  4. Step 4: Simplify right side
    390,656.40x = 74,996,432,763.12
  5. Step 5: Solve for x
    x = 74,996,432,763.12/390,656.40
  6. Step 6: Final answer
    x = 191,975.44

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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.