Home / 76,800.08-105,985.20-42,807.60

Finding the Fourth Proportional to 76,800.08, 105,985.20 and 42,807.60

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Solution

The fourth proportional to 76,800.08, 105,985.20 and 42,807.60 is: 59,075.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,800.08 : 105,985.20 = 42,807.60 : x
  2. Step 2: Convert to fraction form
    76,800.08/105,985.20 = 42,807.60/x
  3. Step 3: Cross multiply
    76,800.08x = 105,985.20 × 42,807.60
  4. Step 4: Simplify right side
    76,800.08x = 4,536,972,047.52
  5. Step 5: Solve for x
    x = 4,536,972,047.52/76,800.08
  6. Step 6: Final answer
    x = 59,075.10

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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.