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Finding the Fourth Proportional to 970.99, 1,457.09 and 646.58

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Solution

The fourth proportional to 970.99, 1,457.09 and 646.58 is: 970.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.99 : 1,457.09 = 646.58 : x
  2. Step 2: Convert to fraction form
    970.99/1,457.09 = 646.58/x
  3. Step 3: Cross multiply
    970.99x = 1,457.09 × 646.58
  4. Step 4: Simplify right side
    970.99x = 942,128.09
  5. Step 5: Solve for x
    x = 942,128.09/970.99
  6. Step 6: Final answer
    x = 970.28

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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.