Home / 123,438.72-170,281.53-72,417.21

Finding the Fourth Proportional to 123,438.72, 170,281.53 and 72,417.21

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Solution

The fourth proportional to 123,438.72, 170,281.53 and 72,417.21 is: 99,898.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,438.72 : 170,281.53 = 72,417.21 : x
  2. Step 2: Convert to fraction form
    123,438.72/170,281.53 = 72,417.21/x
  3. Step 3: Cross multiply
    123,438.72x = 170,281.53 × 72,417.21
  4. Step 4: Simplify right side
    123,438.72x = 12,331,312,935.93
  5. Step 5: Solve for x
    x = 12,331,312,935.93/123,438.72
  6. Step 6: Final answer
    x = 99,898.25

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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.