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Finding the Fourth Proportional to 30,445, 42,015.70 and 18,506.40

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Solution

The fourth proportional to 30,445, 42,015.70 and 18,506.40 is: 25,539.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,445 : 42,015.70 = 18,506.40 : x
  2. Step 2: Convert to fraction form
    30,445/42,015.70 = 18,506.40/x
  3. Step 3: Cross multiply
    30,445x = 42,015.70 × 18,506.40
  4. Step 4: Simplify right side
    30,445x = 777,559,350.48
  5. Step 5: Solve for x
    x = 777,559,350.48/30,445
  6. Step 6: Final answer
    x = 25,539.80

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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.