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Finding the Fourth Proportional to 390,756.51, 586,128.59 and 124,513.21

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Solution

The fourth proportional to 390,756.51, 586,128.59 and 124,513.21 is: 186,767.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,756.51 : 586,128.59 = 124,513.21 : x
  2. Step 2: Convert to fraction form
    390,756.51/586,128.59 = 124,513.21/x
  3. Step 3: Cross multiply
    390,756.51x = 586,128.59 × 124,513.21
  4. Step 4: Simplify right side
    390,756.51x = 72,980,752,790.69
  5. Step 5: Solve for x
    x = 72,980,752,790.69/390,756.51
  6. Step 6: Final answer
    x = 186,767.85

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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.