Home / 30,478.49-42,064.80-18,539.51

Finding the Fourth Proportional to 30,478.49, 42,064.80 and 18,539.51

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Solution

The fourth proportional to 30,478.49, 42,064.80 and 18,539.51 is: 25,587.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,478.49 : 42,064.80 = 18,539.51 : x
  2. Step 2: Convert to fraction form
    30,478.49/42,064.80 = 18,539.51/x
  3. Step 3: Cross multiply
    30,478.49x = 42,064.80 × 18,539.51
  4. Step 4: Simplify right side
    30,478.49x = 779,860,780.25
  5. Step 5: Solve for x
    x = 779,860,780.25/30,478.49
  6. Step 6: Final answer
    x = 25,587.25

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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.