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Finding the Fourth Proportional to 390,707.80, 586,256.10 and 222,357.40

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Solution

The fourth proportional to 390,707.80, 586,256.10 and 222,357.40 is: 333,646.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,707.80 : 586,256.10 = 222,357.40 : x
  2. Step 2: Convert to fraction form
    390,707.80/586,256.10 = 222,357.40/x
  3. Step 3: Cross multiply
    390,707.80x = 586,256.10 × 222,357.40
  4. Step 4: Simplify right side
    390,707.80x = 130,358,382,130.14
  5. Step 5: Solve for x
    x = 130,358,382,130.14/390,707.80
  6. Step 6: Final answer
    x = 333,646.74

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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.