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Finding the Fourth Proportional to 72,570.99, 100,130.45 and 42,339.06

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Solution

The fourth proportional to 72,570.99, 100,130.45 and 42,339.06 is: 58,417.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,570.99 : 100,130.45 = 42,339.06 : x
  2. Step 2: Convert to fraction form
    72,570.99/100,130.45 = 42,339.06/x
  3. Step 3: Cross multiply
    72,570.99x = 100,130.45 × 42,339.06
  4. Step 4: Simplify right side
    72,570.99x = 4,239,428,918.68
  5. Step 5: Solve for x
    x = 4,239,428,918.68/72,570.99
  6. Step 6: Final answer
    x = 58,417.68

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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.