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Finding the Fourth Proportional to 30,342,647.40, 45,513,971.10 and 20,138,980.20

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Solution

The fourth proportional to 30,342,647.40, 45,513,971.10 and 20,138,980.20 is: 30,208,470.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,342,647.40 : 45,513,971.10 = 20,138,980.20 : x
  2. Step 2: Convert to fraction form
    30,342,647.40/45,513,971.10 = 20,138,980.20/x
  3. Step 3: Cross multiply
    30,342,647.40x = 45,513,971.10 × 20,138,980.20
  4. Step 4: Simplify right side
    30,342,647.40x = 916,604,962,806,272.25
  5. Step 5: Solve for x
    x = 916,604,962,806,272.25/30,342,647.40
  6. Step 6: Final answer
    x = 30,208,470.30

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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.