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Finding the Fourth Proportional to 142,130.80, 212,915.40 and 72,060.40

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Solution

The fourth proportional to 142,130.80, 212,915.40 and 72,060.40 is: 107,948.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,130.80 : 212,915.40 = 72,060.40 : x
  2. Step 2: Convert to fraction form
    142,130.80/212,915.40 = 72,060.40/x
  3. Step 3: Cross multiply
    142,130.80x = 212,915.40 × 72,060.40
  4. Step 4: Simplify right side
    142,130.80x = 15,342,768,890.16
  5. Step 5: Solve for x
    x = 15,342,768,890.16/142,130.80
  6. Step 6: Final answer
    x = 107,948.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.