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Finding the Fourth Proportional to 30,331,985.40, 45,497,978.10 and 20,128,318.20

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Solution

The fourth proportional to 30,331,985.40, 45,497,978.10 and 20,128,318.20 is: 30,192,477.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,331,985.40 : 45,497,978.10 = 20,128,318.20 : x
  2. Step 2: Convert to fraction form
    30,331,985.40/45,497,978.10 = 20,128,318.20/x
  3. Step 3: Cross multiply
    30,331,985.40x = 45,497,978.10 × 20,128,318.20
  4. Step 4: Simplify right side
    30,331,985.40x = 915,797,780,653,431.38
  5. Step 5: Solve for x
    x = 915,797,780,653,431.38/30,331,985.40
  6. Step 6: Final answer
    x = 30,192,477.30

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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.