Home / 76,780.36-105,955.12-42,788.68

Finding the Fourth Proportional to 76,780.36, 105,955.12 and 42,788.68

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Solution

The fourth proportional to 76,780.36, 105,955.12 and 42,788.68 is: 59,047.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,780.36 : 105,955.12 = 42,788.68 : x
  2. Step 2: Convert to fraction form
    76,780.36/105,955.12 = 42,788.68/x
  3. Step 3: Cross multiply
    76,780.36x = 105,955.12 × 42,788.68
  4. Step 4: Simplify right side
    76,780.36x = 4,533,679,724.04
  5. Step 5: Solve for x
    x = 4,533,679,724.04/76,780.36
  6. Step 6: Final answer
    x = 59,047.39

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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.