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Finding the Fourth Proportional to 78,036.40, 107,690.88 and 45,790.30

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Solution

The fourth proportional to 78,036.40, 107,690.88 and 45,790.30 is: 63,190.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,036.40 : 107,690.88 = 45,790.30 : x
  2. Step 2: Convert to fraction form
    78,036.40/107,690.88 = 45,790.30/x
  3. Step 3: Cross multiply
    78,036.40x = 107,690.88 × 45,790.30
  4. Step 4: Simplify right side
    78,036.40x = 4,931,197,702.46
  5. Step 5: Solve for x
    x = 4,931,197,702.46/78,036.40
  6. Step 6: Final answer
    x = 63,190.99

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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.